Mold-extracting apparatus.



W. H. FORD. MOLD EXTRAGTING APPARATUS.

APPLICATION FILED APR. 15, 1912.

Patented Nov. 24, 1914 liwww'r:

WM; MM .7 m l 2rd and adapted to receive thereover a WILLIAM H. FORD, LOWELL, MASSACHUSETTS.

MOLD-EXTRACTING- APPARATUS:

Specification of Letters Patent.

Patented Nov. 24, 1914.

Continuation of application filed March 19, 1910, Serial No. 550,424. This application filed April 15, 1912. Serial No. 690,766.

To all whom it may concern Be it known that I, WILLIAM H. Form, a citizen of the United States, and resident of Lowell, county of Middlesex, State of Massachusetts, have invented an Improvement in Mold-Extracting Apparatus, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

My present invention relates to apparatus for preparing molds for casting operations and is herein, for convenience of explanation and illustration, shown applied to the preparation of molds for small articles, such as rings, this typifying the more delicate classes of work, although it will be understood that it is not limited thereto. In my prior application, Ser. No. 550,424 filed March 19, 1910, I have shown an apparatus of this kind provided with a lower shaping or forming receptacle mounted on a base, molding frame, which frame, after the pattern or patterns are properly placed in the sand and have given their shape to the latter, is removed, and the molds extracted therefrom by means of a mold extracting mechanism adapted for cocperation therewith. 'In' said prior application I have duly claimed the special improved construction of formin receptacle, with the molding frame and other parts cooperative therewith for forming the molds, and in the present case, which is a continuation thereof, I am claiming the. improvements in the mold extracting mechanism and the combination therewith of the detachable frame portion of the mechanism.

The invention will be better understood from the following detailed description, taken in connection with the accompanying drawings, wherein a preferred embodiment is illustrated, and will be thereafter pointed out in the appended claims.

Referring 'to the drawings, Figure 1 is an elevation, partly in section, of my improved mold extracting mechanism, showin the molding frame with molds therein fitted in position for extraction of the molds; Flg.

-2 is a central longitudinal vertical section through an illustrative form of mold form-v ing apparatus, showing the manner of cooperation of the molding frame therewith;

and Fig. 3 is a vertical section on line 33 65 of Fig. 2 i

-The manner in which the molds are formed by the apparatus shown in Figs. 2 and 3 is explained in detail in my said prior application, and need be only briefly sum-. marized herein to the extent necessary to show generally the requisites as to the construction of the molding frame, and the manner in which the molds are positioned and engaged therein.

A suitable foundation or support 10 has fixed thereon for convenient removal the bottom plate. 11 of a receptacle or carrier 12 :for the molding patterns and cooperative are the opposite complementary sides of a ring, the mold portions a, b in the two sides being placed together to complete the ring mold. A casing to hold the mold portions a, b at the two sides for shaping them to proper dimensions is provided by a frame 19 which fits down over the receptacle or carrier 12, resting upon the bottom plate 11 thereof. This frame and the receptacle 12 are of oblong shape, and the frame 19 is divided canirallyfof its longer dimension by a partition 20 vwhich is arranged midway between the ends, so that the mold portions (i, b are, of exactly the same dimensions. The bottom of the casing spaces which form the mold ortions a, b are constituted by the tops 0 the slide blocks 15, 16 with the pattern portions projecting upward therefrom, and the frame 19 is shown as provided with ledges 21 at either end for engaging the outer adjacent edges of such slide blocks. A filler 22 is formed to set on the top of the frame 19 to facilitate the filling ofthe mold spaces, this filler being removable from the top of the frame, as shown, by swinging about an axis 23 at one side of the frame an near its top, to permit shaving or cutting off the mold material with a knife or other leveling tool, so that the top of the material is precisely level with the top edge of the till ti with frame The frame 1:) is provided with suitable handles extcndin r from its oppositcends for lifting the frame, with the molds carried thereby, oil of the patterns and shaping receptacle. This is effected preferably after the molds have been cut down to exact size as stated, by straightup lifting movement, whereby the molds are disengaged and freed from t 0 patterns without any possibility of end or side shake or movement likely to break or disturb the delicate portions of the molded cavity such as the tip portions of the ring clamps. This result is aided by the fact that the framein this lifting movement is guided over the receptacle 12 until the molds are well oil" of the patterns. The mold portions being thus removed and held in the frame 19, this frame is now set down on a mold extractor, shown as comprising a plunger-like block 25 provided with a thumb screw or stud 26 for fitting; into a slot 27 oil? a receiving pocket or strap 28, secured to the bench or other support 29, to immovably clamp said plunger block thereto. A rock-sh 3-9 is journaled in brackets or offsets 31 just below the strap .28., and is provided with torwarm: projecting arms thr u gh which extents in pin otal relation central portion. of a hshapcd rod or like member 33 whose ends 3% are provided. with hooks to engage the handles otthe frame, being; normally held forward tm ard the bench, and hence in position to engage said handles, by a coil spring 36 carried on the center portion. 38, having a bearing against the arms 32 and acting on the end. portions 34:. Accordingly, when the operator has placed the frame it) and its mold parts or, b on the top oi: the plunger block 25, shown in Fig. l, he doprcsscs the rock n shaft handle which draws down powerfully on the rod or wire ends 34, and hence on the handles 24 of the frame, causing the mold parts a, h to be accurately ejected or extracted by a. true and straightmp movement, out of the frame as. is depressed. The lower cut-out portion of the frame 19 fits over the plunger block 25 and said block is pretc'ably cut away to provide ledges, as seen at 38, so as to limit the downward movement of the frame by the ledges 21 engaging therewith, thus also providing reduced top portions to follow be.- hind the mold parts (1., Z) and press them entirely out of the frame. The plunger top is also provided with. a central recess 39 to accommodate the central partition 20, this recess being: of a. size to be fitted by said partition. Preferably a metal band or plate ll] is set in the edge of the upper ends of the reduced parts of the plunger, so as to insure durability and maintain a level plane at the corners for lifting accurately the ex trcme corners or ed es of the molds. Also preferably cavities ll are provided in the else top of the plunger suflicient in area and located so as to extend over the Width of the core and length of the pattern, so as to prevent any possibility of disturbing or interfering with the mold at these points.

it hen. my invention is designed for the re quiroments of extremely fine work, such as jewelers" work, 1 preferably make the extractor of extremely hard material, such as indurated fiber that will not scratch the frame, which made of metal. The complei'nentary mold portions can thus be very readily and quickly removed from the frame 19, so that this frame is ready for further use, while the mold portionsmay be fitted together and used for casting in the manner set forte in my said prior application. It is /to be observed that the special construction of the extracting mechanism is arranged for cooperation with the special form of the frame 19 as required by the mold forming parts, so that the construction of this frame enables it to be accurately held and guided for the ejection of the mold por-' tions in a manner to best insure the removal of the molds without danger thereto.

it am aware that various of the details of construction, as set "forth, may be modified without departing from the spirit of the invention in its broader aspects, and I therefore do not desire to be limited as to these, or in any other respects, except as set forth in the ag'ipended claims.

waving described my invention, what ll claim new and desire to secure by Letters Patentis:

1. A mold extractor for molding apparatus, having a plunger-dike upper en adapted to have a. mold with its holding frame littod thereon, pivoted arms for engaging said frame to draw it down over said extractor end, means normally pressing said arms in. a direction for engagement with parts of said frame, and means for lowering said arms.

2. mold extractor for molding apparatus, having a plunger-like upper en adapted to have a mold with its holding frame titted thereon, pivoted arms for engaging portions of said frame to pull it down over said extractor endfispring means adapted to press said arms in a direction to engage said frame, and an oscillating shaft ha vine; lever arms engaged with said pivoted arms to lower them.

3. A mold extractor for molding}, apparatus, comprising" a strap pocket adapted to be. lixcd to a support. a plunger block removahly clamped in said pocket, the top of said block being adapted to have a mold with its holding frame fitted thereon, pivoted arms mounted adjacent said pocket in position to engage said frame when fitted on said plun 'er, and means for lowering said arms.

4: mold extractor for molding apparetus, comprising e plunger block ratus, comprising a plunger block of intht rated fiber formed and adapted to have a mole. With its holding frame fitted thereovei', the sides of said block serving as guides foxy the frame as it is forced downward, and the 20 block edges adjacent the frame hating prot sting Wear plates fitted thereto.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing Witnesses.

WILLIAM H. FORD. Witnesses:

CLYDE L. Roenns,

R. G. Hesser. 

